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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9640c737970189776c0905f16aee47bffae6b7cde48a21cd37f985b869e83155' 
  AND token = 'hHsr7UgOs9l74f/iAgiMbCP2sA9F60fhF5YPqMBqgZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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