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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb08afe87d793f2e516662971cf26f9b15fbc5476cfbe6a70f25b1e8c37c1b31' 
  AND token = 'CiAwuMdpysXtUT2tWCtPKd3QzQ9K9/a0ykKBkjunaxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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