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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4a09a1c4a9932d742699001be1b0166b2f9290fc59c399ea2ed4b3cbc66172' 
  AND token = 'QPdlX9vDJGnWcot3+FiE/n1Ke1e9fa3IMGktTPrzgmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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