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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f99a9ac3178ed03d7ae3b8228184400b075e8d3590131db8fb71eea91e1bd37' 
  AND token = 'b5wRE5+0Z84/e1JoL2VnKe4kk1Qez6kCqcz49JAVz6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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