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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b4ab2e349bda83be76d5f6f93de4b65b0edfb3582cdaddc9609d66556ba29b' 
  AND token = 'c/YeNJLGDeOoORAmvpEZ8HE5em/w7Dby2rH3m3tVs0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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