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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2db3a14ba64fb40b36ca1ca13f8c6bbed2c8ff7d117c7672ac3a98849ac24f' 
  AND token = 'cujwNb2QfP/YlHeWj8kjnPmIB3T0WY9+i/H86OaY4aE=' 
  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"
    }
  }
}