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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c91368eb56fa1ad6ddd0e37f04513c354e883dc9a30b980d75e29e7f049a09' 
  AND token = 'BHorM9eWY4L3l2ZAPn65lO5ALlgF0UJCJI2p9y1II0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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