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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1202a26a8ddbe51918977f15043241e05d0d8af34eeb3607062bae0cc694c2' 
  AND token = '2S2ryXXFUMF6H80r6M/V0bFal7t1aWM4bC1UIns8SOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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