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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661c5a8f217c87a22d0bbe9c1f36f86adc4fad2005a64d2f1f3efcf3bd47a81f' 
  AND token = 'hq3k9N5GdEtca1y3GMpMQoQZI+iYI45JSvnrYm0Wjjs=' 
  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"
    }
  }
}