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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4b3943019e2ad6e98173a2b04c4a9ea61f57185cc7bfe2f032ba25b4e6ab3b' 
  AND token = 'Ut67tNE3wlGzObl8TSlWpEiL/oZFB0PPoALsj3WZhEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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