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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d76a6719b78937e34cb295d7303fd4483b4c0b9fd002d0a962eebf67fdf320' 
  AND token = '/N2Uh8hmu99iETlbYfb+JKT3CVV/f/0agra2DxDsvCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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