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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3660714f0e03575e8e4af48d19baf4e31c02e80f2473c6e16f20757e2950128b' 
  AND token = '+7JN6vdemhQeFmnfwOt1t4CywQuSv4u6UA1DegJx6lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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