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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14261cc34a09b24febd1dda750c6ea2ae16298c4c1496ea68a5e8d4b04572bed' 
  AND token = 'C4+2USABQYYTbQ2d2plMVY5PI8odv8j9xGlb3du8Kv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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