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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717886bd7315a41aedc4b4a0644067f149d6b113d0e4e1c7300cf1128f763c6f' 
  AND token = 'eXfylHJbcPPg4CZpQnFmwESaWHUPKQpgCr95ITZQa3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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