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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43affeac6e4571c8a6edcabc41c9afb6bb3547ff99f3957eaffbc4c13692a6f4' 
  AND token = 'zarVY53w805KdhsJuped53gkJajGaPeCTW1Z5nqSGEk=' 
  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"
    }
  }
}