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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea91d51f90ce17ebf20d23287c61c943ecc55405916dcb0cf78217b88ebcbd8a' 
  AND token = '47ApFs7qEaimR/rZUU8XmB24Fe7a06rvsaLsys7Clmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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