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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b824d193ffb320fb5827f0623f4b936fcc13d6b008692c986f977c3511b2594' 
  AND token = 'EHD8wWjJEM+CA7sHYrY7pOjxfdxXfBAREUIq8XfToVA=' 
  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"
    }
  }
}