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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09a23a34646ffba08b1739178c41d74fedc6cad87612ef0b2747138b1dd4675' 
  AND token = 'XXwR3pS4y+yzJBXdXWPBEWWPNWiNcby+2nOeYrMxS+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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