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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b03208efdd8fad8bad11413d77948b0b8cb474495c2bb6a3c79e558f0ac2cd' 
  AND token = 'JggAHj3kLzBTVWbYQpRTrTLU5kfmbkx2Z2D5Bt7m0bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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