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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bddbece14997d71c8810d22a3e2ee9b99609d24d1efd8b73c3b0cfacbb3c837' 
  AND token = 'lQzy5AmT5ocwdW3wNdWepZCkG0qFlI7D5dIL9m3CcQA=' 
  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"
    }
  }
}