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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd572fbe38e29b6a732f78b921450c4affe2917506e2a6b524020aa5284122f24' 
  AND token = 'fH48TQAcnHgTLLv480A2FLjBFcAMmRCun/nUhYw+nlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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