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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695a7af623a14921f205833c41b0601c4e322456acd0dbfdd4a9664768a0be84' 
  AND token = 'isb9wxsc8vfZm4MXyGJ5/9e+xwpwTlElo6TfKIiIOF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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