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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5f6a482b912bbcfbc6f5f20d2dc49f6991595d370a639d4d0b152034b3aaa7' 
  AND token = 'BNfbnAJyRimBh5gyexZFbKxgCFt6QS3uEJ1JryV77jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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