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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4207134641834b1bbf2b0526726ae4eadc10ce176b3ce6db1c62fb27a54aa952' 
  AND token = 'wpJplHWIK72tFByVshhB0wO6SGzBCrjzXn1ltAkt31Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}