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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95a9188993cb76d9b7a0c61be76fce2bc15d158e29a8aef0b03cfe72f51f74c' 
  AND token = 'Ry5wFsnxFWgLHRBqta4yxLdSpghH4bUUzHrUq9T6KbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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