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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7e5dc3368120cf8fc7e364b1758d1f92f1f396db3fe548d7e58b4c1079755c' 
  AND token = '3VTwzJNFUx4jZoLn0cRDey4w256n0UmSfkxkOCVOohY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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