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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b156ad11a4aac3d429b54b5a410b8b94067ae79da83d49e2cef815cffe53d94' 
  AND token = 'V70gKIbu/3iK5zlKN0DRJHKccS/ynqLNGZNybHEEgDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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