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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659c4247865f06e44ded7167b54c1a89aeaf7aeb09a59d62a236f9b518bc8976' 
  AND token = '8lpKD1Qw2zou5Pcfy1YPhQcrklw8YmLb+hWPLIisQq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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