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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1669fd664f5582de4bdd66d1914856c3ac3474d0a6ec0b3b988d6e3f34a7d9' 
  AND token = 'f0Lpmq2494ndbVgk20d/F2fNAtY4q64BkQ5putocmx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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