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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45ae83d75e1aa4c560a1155936f86eb168fcb0a718065d46c2891e32785b7d0' 
  AND token = 'NsAlpnn49gQ3HHI2Pg9nenNXpwukUGLL5ZWb12wx510=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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