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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d96cbb8951c78abad4bc1f4bf5826e1bfb9123ac4cd192a20e65cbf25012d0' 
  AND token = 'I/BvLH93kZzeBCmKZo72SrG1HevkmVw7Yo9bYCYL4bs=' 
  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"
    }
  }
}