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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7cdc9ff6122ecf57b1988a5f4b8a45e46020959eb3b107e849f66d7a651347' 
  AND token = 'dM57yjDmrW8GjIkUdz3Zh1yJhmzkkBPr9BNBhO62CTs=' 
  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"
    }
  }
}