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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce27df98aebf04ecb1e6487cbbb391b494d17b1cc335e5bb2fc9651045a16a17' 
  AND token = 'OlgJKqU4c1idQs+nVaiIeNPZUD0PW9F2baOqRmyhdaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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