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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3e48e4ec9e21d2b6be0faa46f244bd567df034a775707b25d286fa1aaa53f6' 
  AND token = 'nQ3Pk628+fWi5hk1kOleLPkIRB31MLv6pl9Tt+caUfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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