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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f719af7d965baa638976a16626cb1f41db4860f7838268f8be42b74d0b4c92' 
  AND token = '/D1QBckv7yLHHXSM8/FXoCph7u/Rl27slwp10D6/KHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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