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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118e2dd179632345d05d7def34039333924274138ad8a26257a3e1b4231706c0' 
  AND token = 'mxAwnc483W/yFKGUV3rTzQH1LDQogr2ba++fsO/YumE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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