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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb95d58692aa2ef7b2691f553cc524dd5c13325098d5d31ae8d5e26ba9009f98' 
  AND token = 'JJ8MhZYL5mfPq63eMGhdXVZimik8PB2HK0M3fBJqANk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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