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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f56abb0e3d7e5106b6b3406195adee7b5d761ac6dcca8ee70efa0468c4a5ba' 
  AND token = 'd0Po7vEADKGlCMPpuoRl90ZfZ4QuD6agQroymUX4TXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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