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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1daca0eb5b73396a8af0d10cadb1a6fa032c99ee96ded55cf51c5a22127630b' 
  AND token = 'TcUAGKwIiN1DqKAJMN/OKvIxWyo9WFmGVjOcrWhYpsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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