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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192064b4def2d3132d47388336ae6cd8f29f7ada4974041f0be5e6a4f1bddd14' 
  AND token = 'GiBWEB+m/Hmdkg5KzIhqxt2/NF30xl5U9i154du85iU=' 
  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"
    }
  }
}