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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d6deb3300c211722ee4ddf574e6169d8dd975d90e4ce75e870386f6f6b41c7' 
  AND token = 'wMR9YVHoJkuLm2cDI5IN8TalaiGqpUojSGmt87UfPjo=' 
  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"
    }
  }
}