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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5727fdd4d8e27a6201e10f515249319248dd00c6a4ea98a1555ab43d4e1496' 
  AND token = 'pCr9T4PZ5SO4qqgzTuQ6RFRqsOyqZj61uDe4UWg7Nk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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