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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f6f7e1fe3b1d3a18d7b66c7ee99277297557aa052864fdd5deb7e89b8fa7ea' 
  AND token = 'B/oblpyp5n/k0AWuMyprda59yS/E18Fy/1XOgD/Wqp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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