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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f6f39b810b3fb4b86c4f4a59e4af2499827dbbe118c5be6a9ac26ebea8aa0c' 
  AND token = '+LXvKpo2RvpaP5HBKRAWvEPGPBOKSNb30TjZUoC3agg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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