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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059091b9dab7893f6a954f096d7450c6808ec9fc78df47dec382dc7d7e6e04cd' 
  AND token = 'crvD5KOTSHxaH9uc9b3zTCuYRMY0iUPWprI5idK8xgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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